Buggy code:
public class Base64Test { private final Random _random = new Random ( ) ; public Random getRandom ( ) { } @ Test public void testIsStringBase64 ( ) { } @ Test public void testBase64 ( ) { } @ Test public void testChunkedEncodeMultipleOf76 ( ) { } @ Test public void testCodec68 ( ) { } @ Test public void testCodeInteger1 ( ) throws UnsupportedEncodingException { } @ Test public void testCodeInteger2 ( ) throws UnsupportedEncodingException { } @ Test public void testCodeInteger3 ( ) throws UnsupportedEncodingException { } @ Test public void testCodeInteger4 ( ) throws UnsupportedEncodingException { } @ Test public void testCodeIntegerEdgeCases ( ) { } @ Test public void testCodeIntegerNull ( ) { } @ Test public void testConstructors ( ) { } @ Test public void testConstructor_Int_ByteArray_Boolean ( ) { } @ Test public void testConstructor_Int_ByteArray_Boolean_UrlSafe ( ) { } @ Test public void testDecodePadMarkerIndex2 ( ) throws UnsupportedEncodingException { } @ Test public void testDecodePadMarkerIndex3 ( ) throws UnsupportedEncodingException { } @ Test public void testDecodePadOnly ( ) throws UnsupportedEncodingException { } @ Test public void testDecodePadOnlyChunked ( ) throws UnsupportedEncodingException { } @ Test public void testDecodeWithWhitespace ( ) throws Exception { } @ Test public void testEmptyBase64 ( ) { } @ Test public void testEncodeDecodeRandom ( ) { } @ Test public void testEncodeDecodeSmall ( ) { } @ Test public void testEncodeOverMaxSize ( ) throws Exception { } @ Test public void testCodec112 ( ) { } private void testEncodeOverMaxSize ( int maxSize ) throws Exception { } @ Test public void testIgnoringNonBase64InDecode ( ) throws Exception { } @ Test public void testIsArrayByteBase64 ( ) { } @ Test public void testIsUrlSafe ( ) { } @ Test public void testKnownDecodings ( ) throws UnsupportedEncodingException { } @ Test public void testKnownEncodings ( ) throws UnsupportedEncodingException { } @ Test public void testNonBase64Test ( ) throws Exception { } @ Test public void testObjectDecodeWithInvalidParameter ( ) throws Exception { Base64 b64 = new Base64 ( ) ; try { <START_BUG> b64 . decode ( new Integer ( 5 ) ) ; <END_BUG> fail ( "decode(Object)<seq2seq4repair_space>didn't<seq2seq4repair_space>throw<seq2seq4repair_space>an<seq2seq4repair_space>exception<seq2seq4repair_space>when<seq2seq4repair_space>passed<seq2seq4repair_space>an<seq2seq4repair_space>Integer<seq2seq4repair_space>object" ) ; } catch ( DecoderException e ) { } } @ Test public void testObjectDecodeWithValidParameter ( ) throws Exception { } @ Test public void testObjectEncodeWithInvalidParameter ( ) throws Exception { } @ Test public void testObjectEncodeWithValidParameter ( ) throws Exception { } @ Test public void testObjectEncode ( ) throws Exception { } @ Test public void testPairs ( ) { } @ Test public void testRfc2045Section2Dot1CrLfDefinition ( ) { } @ Test public void testRfc2045Section6Dot8ChunkSizeDefinition ( ) { } @ Test public void testRfc1421Section6Dot8ChunkSizeDefinition ( ) { } @ Test public void testRfc4648Section10Decode ( ) { } @ Test public void testRfc4648Section10DecodeWithCrLf ( ) { } @ Test public void testRfc4648Section10Encode ( ) { } @ Test public void testRfc4648Section10DecodeEncode ( ) { } private void testDecodeEncode ( String encodedText ) { } @ Test public void testRfc4648Section10EncodeDecode ( ) { } private void testEncodeDecode ( String plainText ) { } @ Test public void testSingletons ( ) { } @ Test public void testSingletonsChunked ( ) { } @ Test public void testTriplets ( ) { } @ Test public void testTripletsChunked ( ) { } @ Test public void testUrlSafe ( ) { } @ Test public void testUUID ( ) throws DecoderException { } @ Test public void testByteToStringVariations ( ) throws DecoderException { } @ Test public void testStringToByteVariations ( ) throws DecoderException { } private String toString ( byte [ ] data ) { } }

Fix:
b64 . decode ( Integer . valueOf ( 5 ) ) ;